Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5b6613bfce3497…

MALICIOUS

PDF

76.9 KB Created: 2021-03-22 06:02:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2477a419a6d730bc209def033076a6d1 SHA-1: 99f7af863553770a7333eb25bd380b821e5eb039 SHA-256: 9b5b6613bfce34979303b727d5ce7a48e76e51db824af8518777a2872dd04782
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with a critical heuristic identifying it as a potential link farm. The document body, though heavily obfuscated, suggests a lure related to 'Fahrenheit 451 study guide pdf', which is likely a pretext to encourage users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mezovuduw.ru/award?keyword=fahrenheit+451+part+3+study+guide+pdf
    • http://xelamoxadavas.mywebcommunity.org/abstract_reasoning_questions_and_answers_free_download.pdf
    • http://xoziduso.mypressonline.com/how_much_is_a_kindle_fire_hd_7_worth.pdf
    • https://static.s123-cdn-static.com/uploads/4365636/normal_5fe46d54d1c69.pdf
    • https://cdn-cms.f-static.net/uploads/4404121/normal_6015fda966aea.pdf
    • https://gikotaduxig.weebly.com/uploads/1/3/1/4/131454052/3544811.pdf
    • https://cdn-cms.f-static.net/uploads/4378605/normal_600ece2ce745b.pdf
    • https://gatodagimisosog.weebly.com/uploads/1/3/1/3/131379801/palolidovima-mudekugevi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ddc2d688-399e-4d71-96e0-f85f168e54a2/vikizifobuvutoxutemukales.pdf
    • http://tudutov.rf.gd/pasefaxiranegoteke.pdf
    • https://uploads.strikinglycdn.com/files/3cf7bf88-45b3-49b4-ada9-62f17c672891/rotijejinomexiwoluzikef.pdf
    • https://uploads.strikinglycdn.com/files/8d879705-fd20-4ee8-86b1-7e3263c3e045/54218460191.pdf
    • https://uploads.strikinglycdn.com/files/dd18ba37-018a-4c09-870c-d3a0df4bd6b7/75418267626.pdf
    • https://uploads.strikinglycdn.com/files/7f3f5aa7-f0b4-4227-8454-4a97a51d560e/how_to_prepare_for_pmp_exam.pdf
    • https://uploads.strikinglycdn.com/files/07c9b223-3f00-4058-9c77-6651a7d76d56/67875812847.pdf
    • http://kodigejo.rf.gd/cinahl_nursing_guide_reference.pdf
    • http://siletafelit.epizy.com/93812073483.pdf
    • https://uploads.strikinglycdn.com/files/28b3b73b-0706-4917-a755-c1773ec4b3cb/65415372720.pdf
    • http://kozosakesaganu.epizy.com/guwegu.pdf
    • http://tewederukafolez.rf.gd/asp.net_ajax_interview_questions_and_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed9c.bin
b52acd87aab596931abab6ef26f72f75c38df3ffa762bc143d862a02b0de0be6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED9C 5756 bytes
font_01_sfnt_off0001014a.bin
471a43a1469688c6a31dc51b4a1cd5ec22cafa0030183816546a5fe30c2ffcad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1014A 10880 bytes

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